The most-talked-about stocks in the Reddit subforum Wallstreetbets were mostly advancing hours before Wednesday's opening bell.

Super Micro Computer (SMCI) was up 11.3% in pre-bell activity, after a 1.2% increase at Tuesday's close. Super Micro Computer reported higher fiscal Q1 preliminary revenue.

SpaceX (SPCX) rose by 7.8% premarket, reversing a 0.1% decline from the previous session. SpaceX and Tesla have formed special committees to explore a potential merger, CEO Elon Musk said, news outlets reported, citing SpaceX's earnings webcast.

Nebius Group (NBIS) was 2.7% higher in premarket hours, after a 0.7% increase from Tuesday's session.

Micron Technology (MU) advanced by 1.8% pre-bell, swinging from a 1% decline at Tuesday's close.

CoreWeave (CRWV) was up 1.7% hours before market open, following a 1.7% increase from Tuesday's session.

Nvidia (NVDA) rose by 1.5% in premarket activity, reversing a 0.3% decline at Tuesday's close.

Tesla (TSLA) was 1.2% higher pre-bell, after a 1.5% increase from the previous session.

Bucking the trend, Netflix (NFLX) fell 6.5% in premarket hours, after a 1.7% decline at Tuesday's close. Netflix provided a downbeat Q4 outlook, below analysts' expectations.